That means everything widgets do requires handling the data retrieved from the user and passing it among themselves to perform one or more operations. The state of an app can be updated or completely changed at the start of an application, or when a page reloads. The “state” in Flutter refers to the data stored inside a widget that can be modified depending on the current operation. Let’s talk about what it means to manage the state in a Flutter application. In this article, we will be building a sample app with one of the best state management packages for Flutter: Provider.īefore we begin, note that this article assumes you have an operational Flutter development environment on your machine, along with working knowledge of Flutter. Many state management solutions have been developed over the years, each based on the same concept of manipulating or modifying the state in the cleanest and most easily accessible way possible. Therefore, managing this data in the best way possible ensures the application is clean-coded, properly abstracted, operates smoothly, and delivers the best results possible. This is because everything we do in Flutter, from operations related to receiving information from a user to displaying a piece of data, deals with the state. The concept of state management remains one of the most critical topics in Flutter. A quick guide to Provider for Flutter state management import 'package:flutter/material.Chinedu Imoh Follow Chinedu is a tech enthusiast focused on full-stack JavaScript and Infrastructure engineering. Let us first consider a simple stateful widget example. Now under Scaffold widget, whatever widgets you have, all are rebuilt for a press of button!īut give us a proof! How does stateful widget rebuild the whole tree? That is from your home page, then it rebuilds the scaffold widget, and all the child widgets under it. Moreover, that bad effect starts rebuilding widgets from the very top. Just like too much sunlight takes a heavy toll on your skin, a stateful widget has a serious effect on the whole widget tree. We can do the same with the help of provider package, CgangeNotifier class and a stateless widget. People say stateful widget is useful when the part of the user interface you are describing can change dynamically. If you search Internet, it says many things about stateful widget. Why not, I am going to show you in a minute. In fact, when a stateless widget does the same job, why you should use that? In my opinion, stateful widget doesn’t make any sense. When do I use stateful widget? Or, should I? In this example we will see how a stateful widget takes a toll on the whole widget tree. So let’s start with a simple stateful widget example where user presses a button that increments the value. We want the proof that provider works better and faster than stateful widget. Therefore how to use flutter provider doesn’t concern us. Once Flutter gets the provider, either it uses watch method to reflect the changed property or read method to change the event or, in other words, call the method on it. Once it knows, Flutter goes up the widget tree until it finds the provided value. In fact, according to the generics, Flutter knows what “type” of provider it is looking for. The generics, the value inside brackets point to a particular provider. In a large application, there could be many types of provider. With reference to the provider’s best usage patterns we will also learn how to organize our code. These tools will show you how many widgets are rebuilt when user presses a button. To prove that Provider is more efficient than stateful widget, we have used Android Studio Flutter Inspector and Flutter Performance, which will track the widget rebuilding. Not only that, we will also show proof of it. In this article we will look into that matter. Will that really reduce widget re-building and enhance the efficiency of our Flutter App? However, the question is what is the most efficient way to use Provider package?Īnother question is how we can use Flutter ChangeNotifier class along with Provider, so that it gives us the best result. How do we use a provider in Flutter? Well, we have seen many examples already.
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